. Chemistry of dye-stuffs. which, by reduction with zinc dust, is decomposed, in thedirection shown by the hne, into p. toluylenediamine ando. toluidine. Assuming that anihne takes part in the sub-sequent oxidation with potassium bichromate, a Safranineof the following composition must be formed :—. the method of formation being indicated by the lines drawnacross the formula. If the aniline be replaced by monoalkylorthotoluidinein this reaction, a Safranine of very clear shade is produced. Safranine has recently been found to be poisonous,*lining-material dyed therewith having produced a pecul
. Chemistry of dye-stuffs. which, by reduction with zinc dust, is decomposed, in thedirection shown by the hne, into p. toluylenediamine ando. toluidine. Assuming that anihne takes part in the sub-sequent oxidation with potassium bichromate, a Safranineof the following composition must be formed :—. the method of formation being indicated by the lines drawnacross the formula. If the aniline be replaced by monoalkylorthotoluidinein this reaction, a Safranine of very clear shade is produced. Safranine has recently been found to be poisonous,*lining-material dyed therewith having produced a peculiareruption on the skin. In combination with sundry dye-stuffs, such as MethyleneBlue, Safranine is fairly fast, and is largely used in cottondyeing and calico printing. When Safranine is diazotised, and then exposed to theaction of ^-naphthol, it furnishes an azo dye-stuff, exhibiting * According to Th. Weil [Zeits. f. Hygiene, 1891, p. 35), 0*05 gramme ofSafranine hydrochloride per kilogramme of body weight is a fatal dose fordogs, when administered as a subcutaneous injection. 308 CHEMISTEY OF DYE-STUFFS. the properties of a basic dye, and distinguished by the indigoshade and great fastness of its cotton dyeings. This im-portant dye-stuff, which was introduced by Kegel (Beyerand Kegel of
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